Keto Roasted Spaghetti Squash with Alfredo Sauce

Keto Roasted Spaghetti Squash with Alfredo Sauce Recipe

A luxuriously creamy, low-carb comfort dish that’s ready in under an hour.

KEY INFO:
  • Prep Time: 15 minutes
  • Cook Time: 45 minutes
  • Total Time: 1 hour
  • Servings: 4
  • Calories: 425 per serving
  • Fat: 38g
  • Protein: 12g
  • Carbs: 8g (Net: 6g)
  • Difficulty: Easy
  • Dietary: Keto, Gluten-free, Vegetarian-optional
EQUIPMENT NEEDED:
  • Large baking sheet
  • Sharp chef’s knife
  • Fork
  • Large skillet
  • Whisk
  • Measuring cups and spoons

Alternative tools:

  • Rimmed cookie sheet (instead of baking sheet)
  • Regular dinner fork (instead of whisk)

Spaghetti squash, chef's knife, measuring spoons, and fresh garlic on a sunlit kitchen countertop

INGREDIENTS:
For the Squash:
  • 1 medium spaghetti squash (≈3 lbs/1.4 kg)
  • 2 tbsp olive oil (30ml)
  • 1/2 tsp salt (2.5g)
  • 1/4 tsp black pepper (1g)
For the Alfredo Sauce:
  • 1 cup heavy cream (240ml)
  • 1/2 cup unsalted butter (113g)
  • 2 cloves garlic, minced (≈6g)
  • 1 cup freshly grated Parmesan (100g) [Pre-grated won’t melt properly]
  • 1/4 tsp ground nutmeg (1g)
  • Salt and pepper to taste
Optional Garnish:
  • Fresh parsley, chopped
  • Extra Parmesan for serving
METHOD:
  1. Preheat oven to 400°F (200°C).
  2. Carefully cut spaghetti squash in half lengthwise. Tip: Score the skin first to guide your knife.
  3. Scoop out seeds using a spoon.
  4. Brush cut sides with olive oil and season with salt and pepper.
  5. Place squash cut-side DOWN on baking sheet.
  6. Roast for 35-45 minutes until fork-tender. The skin should give slightly when pressed.

Two halved spaghetti squash glistening with olive oil and speckled with black pepper on a baking sheet

While squash roasts, make the sauce:
  • Melt butter in skillet over medium heat.
  • Add garlic, cook for 1 minute until fragrant.
  • Pour in cream, bring to gentle simmer.
  • Whisk in Parmesan until smooth.
  • Season with nutmeg, salt, and pepper.

Melting butter, cream, and grated Parmesan mixing in a stainless steel skillet with steam rising

  1. Using a fork, scrape squash into spaghetti-like strands.
  2. Toss strands with hot Alfredo sauce.

Close-up of golden squash strands being transformed into pasta-like ribbons under warm kitchen lighting

CRUCIAL TIPS:
  • Choose a squash that feels heavy for its size.
  • Don’t overcook – you want strands, not mush.
  • Sauce too thick? Thin with warm cream.
  • Always use freshly grated Parmesan.
STORAGE & SCALING:
  • Keeps 3 days refrigerated.
  • Reheat gently to prevent sauce separation.
  • Recipe doubles easily for crowds.
  • Squash and sauce can be prepared separately.
VARIATIONS:
  • Add grilled chicken or shrimp.
  • Stir in sautéed mushrooms.
  • Mix in wilted spinach.
  • Spice it up with red pepper flakes.
COMMON MISTAKES:
  • Using pre-grated cheese (it won’t melt properly).
  • Overcooking the squash.
  • Boiling rather than simmering the sauce.
  • Not drying squash well before adding sauce.

Artfully plated Alfredo squash strands garnished with parsley and Parmesan on a black ceramic plate under moody lighting

Now you’ve got a proper keto pasta alternative that actually satisfies those Italian food cravings. The key is in the roasting – it brings out the squash’s natural sweetness while keeping the strands perfectly al dente.

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